The main drives of succession include canopy density of rubber forest, management, climate, soil condition and the biological properties of vegetation.
演替驱动力主要有：胶林郁闭度、胶林抚育管理措施、气候和土壤条件以及胶林植被本身的生物学特性。
There are large areas low-quality forest with low canopy density, low productivity because of over-harvesting operations and natural disasters.
由于多次过量采伐干扰及自然灾害，小兴安岭林区形成大面积郁闭度较低、生产力低下且林相衰败的低质林。
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